import java.util.*;
public class Example3_9{
    public static void main(String args[]){
      Scanner reader =new Scanner (System.in);
      double sum=0;
      int m=0;
      while (reader.hasNextDouble()){
          double x=reader.nextDouble();
          m=m+1;
         sum=sum+x;
        }
        System.out.printf("%d个数的和为",m,sum);
        System.out.printf("%d个数的平均值是%d\n",m,sum/m);
}}
